Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f607268ebcec590d8e17d2462892b569870ef0abadf0f6d8f0728f37956c010e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16